SAP Message UD631 - Internal error when calling SDU_MARK_TREE_FETCH (Incorrect parameter)

Diagnosis
The function module SDU_MARK_TREE_FETCH triggered one of thefollowing exceptions:
- table OBJECT_LIST is empty (no objects were copied to themodule)
- nothing was selected ( the copied objects do not exist )
- incorrect type specified in OBJECT_LIST ( one of the copiedobjects has the incorrect type )

Procedure
Contact the person responsible for the program.